陳 晨,高共鳴
(1.江蘇省常州市第一人民醫(yī)院 麻醉科,江蘇 常州,213000; 2.江蘇省常州市第二人民醫(yī)院 骨科,江蘇 常州,213000)
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不同劑量右美托咪定復(fù)合羅哌卡因行肌間溝臂叢神經(jīng)阻滯的阻滯效果和不良反應(yīng)
陳晨1,高共鳴2
(1.江蘇省常州市第一人民醫(yī)院 麻醉科,江蘇 常州,213000; 2.江蘇省常州市第二人民醫(yī)院 骨科,江蘇 常州,213000)
摘要:目的探討兩種不同劑量的右美托咪定復(fù)合羅哌卡因行肌間溝臂叢神經(jīng)阻滯的效果和不良反應(yīng)。方法40例行單側(cè)上肢/手部手術(shù)的患者隨機分為兩組,即0.5 μg/kg右美托咪定復(fù)合羅哌卡因組(DR1組)和1 μg/kg右美托咪定復(fù)合羅哌卡因組(DR2組)。比較2組患者阻滯起效時間,阻滯后4、6、8、10、12和14 h的靜息和運動阻滯效果,術(shù)后血流動力學改變和鎮(zhèn)靜等不良反應(yīng)。結(jié)果DR1組患者感覺和運動阻滯開始恢復(fù)和完全恢復(fù)的時間均顯著早于DR2組患者 (P<0.01); DR2組在6 h活動疼痛評分和術(shù)后8、10、12和14 h的靜息和活動疼痛評分均顯著優(yōu)于DR1組(P<0.05)。結(jié)論1 μg/kg右美托咪定復(fù)合羅哌卡因較0.5 μg/kg右美托咪定復(fù)合羅哌卡因用于肌間溝臂叢神經(jīng)阻滯,可以增強臂叢神經(jīng)阻滯效果且不增加不良反應(yīng)。
關(guān)鍵詞:右美托咪定; 羅哌卡因; 肌間溝臂叢神經(jīng)阻滯
臂叢神經(jīng)阻滯單獨用于上肢和手部手術(shù)常能取得較好的麻醉效果。羅哌卡因具有長達8~14 h的阻滯效果和較高的安全性,成為外周神經(jīng)阻滯首選局麻藥[1-4]。阿片類藥物能引起惡心、嘔吐、便秘等胃腸道反應(yīng)和皮疹、瘙癢等過敏反應(yīng),甚至呼吸抑制[5]。動物實驗和受試者在體研究[6-13]均發(fā)現(xiàn)α2受體激動劑+局麻藥鞘內(nèi)注射或者行外周神經(jīng)阻滯可能延長局麻藥作用時間。薈萃分析[14]發(fā)現(xiàn),右美托咪定輔助鞘內(nèi)注射延長感覺和運動阻滯的確切效果,而外周神經(jīng)阻滯加用右美托咪定能延長感覺和運動阻滯時間。動物研究和在體實驗[8,15]均表明右美托咪定延長局麻藥的阻滯效果有劑量依賴性。本研究比較羅哌卡因聯(lián)合兩種常用劑量右美托咪定(0.5,1 μg/kg)用于臂叢神經(jīng)阻滯的效果及對于術(shù)后不良反應(yīng)的影響,現(xiàn)報告如下。
1資料與方法
1.1一般資料
選擇2015年9月—2016年2月在常州市第一人民醫(yī)院骨科行上肢/手部手術(shù)患者40例,經(jīng)常州市第一人民醫(yī)院倫理委員會同意,并獲得患者或其委托人簽署的知情同意書?;颊呷脒x標準為擇期行單側(cè)上肢/手部手術(shù),接受單獨肌間溝臂叢神經(jīng)阻滯的患者,ASA Ⅰ~Ⅲ級。排除標準:① 拒絕外周神經(jīng)阻滯或者阻滯失敗; ② 因凝血功能障礙、皮膚感染或者對羅哌卡因過敏無法進行外周神經(jīng)阻滯; ③ 聽力或語言嚴重受損交流不暢; ④ 糖尿病血糖控制不佳或者合并外周神經(jīng)病變; ⑤ 嚴重的心血管病變; ⑥ 肝功能或者腎功能不全; ⑦ 長期自我服用止痛藥; ⑧ 嚴重的呼吸系統(tǒng)疾病; ⑨ 長期服用可樂定、酒精或者藥物成癮患者; ⑩ BMI>35 kg/m2。根據(jù)計算機軟件生成的隨機數(shù)字表將40例患者隨機分為2組,即右美托咪定(0.5 μg/kg)1 mL+0.5%羅哌卡因15 mL(DR1組)和右美托咪定(1 μg/kg)1 mL+0.5%羅哌卡因15 mL(DR2組),每組20例。2組患者的性別、年齡、BMI、ASA分級、術(shù)前疼痛評分均無顯著差異(P>0.05)。見表1。
表1 DR1組和DR2組基線資料比較
1.2方法
手術(shù)當日清晨將患者接入手術(shù)室,連接標準監(jiān)護導聯(lián),開放外周靜脈,給予0.02 mg/kg咪達唑侖鎮(zhèn)靜和50 μg芬太尼鎮(zhèn)痛,并用鼻導管1~2 L/min流量吸氧。消毒鋪單之后在超聲引導下辨別臂叢神經(jīng)結(jié)構(gòu),用平面內(nèi)技術(shù)引導穿刺針進行上、中、下3點注射阻滯臂叢神經(jīng),每點注射5 mL復(fù)合溶液,由同一人完成操作。超聲均采用高頻線陣探頭10~20 Hz(Sonosite,Sonosite Inc.,USA)。阻滯完成后,由另1名麻醉助理醫(yī)師每2 min評估1次患者感覺和神經(jīng)阻滯程度,直至達到手術(shù)要求。感覺阻滯應(yīng)用針刺三分法確定手術(shù)區(qū)域阻滯程度:0分,感覺正常; 1分,有感覺但是不痛; 2分,無感覺。運動阻滯程度用上肢抬起程度來評估:0分,運動正常; 1分,能稍抬起但無力; 2分,完全不能抬起。
1.3觀察指標
觀察阻滯后2、4、6、8、10、12和14 h的阻滯情況。① 疼痛指標:應(yīng)用視覺模擬評分法(VAS)評價疼痛程度(0分,無痛;10分,劇烈疼痛); ② 感覺阻滯時長:應(yīng)用C5皮區(qū)感覺消失時間計算; ③ 運動阻滯時長:應(yīng)用肱二頭肌肌力恢復(fù)評價運動阻滯時長(0級,完全癱瘓;1級,可收縮;2級,不能抗重力; 3級,抗重力不抗阻力; 4級,可抗弱阻力; 5級,正常); ④ 若患者感覺神經(jīng)阻滯超過14 h,由患者自述或者陪護告知夜間阻滯消失時間,并與已有的護理記錄核對,記錄準確時間; ⑤ 不良反應(yīng):竇緩、低血壓、呼吸抑制與過度鎮(zhèn)靜(Ramsay鎮(zhèn)靜評分:1分為煩躁不安; 2分為清醒,安靜合作;3分為嗜睡,對指令反應(yīng)敏捷;4分為淺睡眠,可迅速喚醒;5分為入睡,反應(yīng)遲鈍;6分為深睡眠,無法喚醒)。已有的研究[16-17]表明,羅哌卡因單獨鎮(zhèn)痛持續(xù)時間平均為11.1 h(SD5)。Ⅰ類錯誤雙側(cè)0.05%,把握度80%,失訪率15%的條件下,每組20個患者能夠檢測出4 h鎮(zhèn)痛時間差異。
1.4統(tǒng)計學方法
采用SPSS 21.0錄入數(shù)據(jù)分析。計量資料用均數(shù)±標準差表示,組間比較采用t檢驗,計量資料用χ2檢驗,等級資料用Wilcoxon秩和檢驗。
2結(jié)果
DR2組感覺和運動阻滯起始時間和完全起效時間均快于DR1組。DR1組患者感覺和運動阻滯開始恢復(fù)和完全恢復(fù)的時間均顯著早于DR2組患者(P<0.01); 2組患者在4、6 h靜息疼痛評分以及4 h活動疼痛評分比較無顯著差異(P>0.05)。 DR2組在6 h活動疼痛評分和術(shù)后8、10、12和14 h的靜息和活動疼痛評分均顯著優(yōu)于DR1組(P<0.05)。見表2。DR2組患者心率低于DR1組。2組各時間點血壓無顯著差異(P>0.05)。見圖1、2。2組在PACU和病房的鎮(zhèn)靜評分無顯著差異(P>0.05)。2組患者術(shù)后均未出現(xiàn)嚴重并發(fā)癥。DR2組有1例患者出現(xiàn)術(shù)后嘔吐。2組患者均無明顯口干、頭暈、譫妄、尿潴留等。
表2 2組靜息痛和活動痛VAS評分
與DR1組比較,*P<0.05,**P<0.01。
圖1 2組手術(shù)室和術(shù)后病房心率比較
圖2 2組手術(shù)室和術(shù)后病房MAP比較
3討論
超聲的使用使得神經(jīng)阻滯“可視化”,縮短了操作時間,避免了血管內(nèi)或者神經(jīng)內(nèi)注射,提高單次注射大劑量局麻藥和輔助藥的安全性,保證了阻滯效果。α2受體激動劑復(fù)合局麻藥用于外周神經(jīng)阻滯已有臨床研究和報道。大型薈萃分析[14,18]發(fā)現(xiàn)右美托咪定復(fù)合局麻藥能夠延長局麻藥阻滯效果。大鼠實驗[12]發(fā)現(xiàn),右美托咪定復(fù)合羅哌卡因具有濃度依賴性的延長感覺和神經(jīng)阻滯的作用。本研究首次在同一個隨機對照研究中比較了兩種不同劑量右美托咪定(0.5、1 μg/kg)復(fù)合常用劑量羅哌卡因的起效時間、感覺和運動阻滯時長以及不良反應(yīng)的發(fā)生情況,探討了α2受體激動劑右美托咪定復(fù)合局麻藥在外周神經(jīng)阻滯的臨床使用價值和安全劑量。
α2受體激動劑復(fù)合局麻藥可能增強鞘內(nèi)注射和外周神經(jīng)阻滯鎮(zhèn)痛效果的確切機制尚不十分明確。右美托咪定具有中樞性鎮(zhèn)痛作用,但研究[19]表明腹腔注射右美托咪定在中樞達到提高鎮(zhèn)痛作用的閾值ED50為144 μg/mg,而局部注射右美托咪定遠遠小于該濃度[20]。因此可以排除右美托咪定的中樞鎮(zhèn)痛作用。Brummett等[13]研究發(fā)現(xiàn),預(yù)先給予α1和α2受體拮抗劑并不能減弱右美托咪定復(fù)合羅哌卡因的鎮(zhèn)痛效果,但能夠減弱腎上腺素和硬膜外給予右美托咪定的作用。因此推測右美托咪定在外周可能通過下述機制發(fā)揮作用:一是收縮血管,延長局部麻醉藥物吸收時間,延長阻滯效果[21]; 二是可能直接作用外周血管或者神經(jīng)發(fā)揮作用[22-23]。
右美托咪定引起血液藥物濃度升高可能導致血流動力學變化和鎮(zhèn)靜等不良反應(yīng)。本研究在手術(shù)室1 h內(nèi)和術(shù)后病房1 h內(nèi)未見明顯的血流動力學差異。研究[24-25]表明右美托咪定在重癥監(jiān)護鎮(zhèn)靜的血藥濃度為0.4~0.8 ng/mL,而半衰期為1.8~2.2 h。個別研究[20]報道了外周神經(jīng)阻滯復(fù)合應(yīng)用右美托咪定后的血藥濃度發(fā)現(xiàn),注射后30 min臨床血藥濃度最高,可達鎮(zhèn)靜深度,后逐漸下降。因此作者推測兩種常用臨床劑量的右美托咪定復(fù)合局麻藥用于外周神經(jīng)阻滯其安全性無明顯差異。作者推測1 μg/kg右美托咪定復(fù)合羅哌卡因較0.5 μg/kg右美托咪定復(fù)合羅哌卡因用于肌間溝臂叢神經(jīng)阻滯可以增強臨床感覺和運動神經(jīng)阻滯效果,且不增加不良反應(yīng)。
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收稿日期:2016-04-19
中圖分類號:R 614
文獻標志碼:A
文章編號:1672-2353(2016)15-053-04
DOI:10.7619/jcmp.201615015
Block effect and adverse reactions of different doses of dexmedetomidine combined with ropivacaine in patients with interscalene brachial plexus blocks
CHEN Chen1,GAO Gongming2
(1.Department of Anesthesiology,Changzhou First People′s Hospital,Changzhou,Jiangsu,213000; 2.Department of Orthopedics,Changzhou Second People’s Hospital,Changzhou,Jiangsu,213000)
ABSTRACT:ObjectiveTo explore the block effect and adverse reactions of different doses of dexmedetomidine combined with ropivacaine in patients with interscalene brachial plexus blocks.MethodsForty patients with elective upper limb/hand surgery were randomly divided into 0.5 μg/kg dexmedetomidine combined with ropivacaine group (group DR1) and 1 μg/kg dexmedetomidine combined with ropivacaine group (group DR2).Block onset time,resting and motor block effects at 4,6,8,10,12 and 14 hours after blocking as well as hemodynamic changes and adverse reactions were compared between two groups.ResultsThe time of sensory and motor block recovery in group DR1 were significantly shorter than those in group DR2 (P<0.05).The active pain score at 6 h and resting and active pain scores at 8,10,12,14 h in group DR2 were significantly better than those in group DR1 (P<0.05).ConclusionCombined with 0.5 μg/kg dexmedetomidine and ropivacaine,1 μg/kg dexmedetomidine combined with ropivacaine for interscalene brachial plexus blocks can improve block effect without increasing the adverse reactions.
KEYWORDS:dexmedetomidine; ropivacaine; interscalene brachial plexus blocks